problem KRX3

[VE3NFK]

Hi

K3 sn 709   just installed:

2 x KSYN3A
1 x KXVV3B
audio mod (little board with 2 caps and 2 power resistors)
replaced 6 tin pins on PA and main board KPA3 power connectors
replaced power fans with 2 x Noctua's
did mods on KBPF3 x 2

Result  - radio still works :-)  BUT no signals on the sub rx   - can hear band noise but that is all....
sensitivity on the low bands (300khz-900khz) does seem to be improved at all.

Advise as to what I have done wrong would be appreciated!

73  John VE3NFK

[Don Wilhelm-4]

John,

Check the SUB-IN and SUB-OUT connectors on the KRX3 to be sure they are
properly inserted and seated.
Also re-check the cables for the SubRX synthesizer.

Do you have the KBPF3 installed?  That is required for receiving the low
band.  And you should upgrade the KBPF3(s) with the newly announced
upgrade kits or order the KBPF3A and the two bypass capacitors for the
regulators (one for the main RX and another for the SubRX.

73,
Don W3FPR

On 6/28/2015 4:02 PM, VE3NFK wrote:

> Hi
>
> K3 sn 709   just installed:
>
> 2 x KSYN3A
> 1 x KXVV3B
> audio mod (little board with 2 caps and 2 power resistors)
> replaced 6 tin pins on PA and main board KPA3 power connectors
> replaced power fans with 2 x Noctua's
> did mods on KBPF3 x 2
>
> Result  - radio still works :-)  BUT no signals on the sub rx   - can hear
> band noise but that is all....
> sensitivity on the low bands (300khz-900khz) does seem to be improved at
> all.
>
>

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[VE3NFK]

Hi

I like to see the resolution of problems..  so here goes for mine..

With the expert help of Howard at Elecraft; 3 phone calls and 2 emails later;

the problem was Synth2 not working ... the fix was to remove it - look at it :-)
and replace it.  
Now the sub RX works great.

73  John VE3NFK